Valve mechanism.



11. E. PERRAULT; VALVE MECHANISM.

, APPLIUAIION FILED OUT-24, 1907.

920, 99 1 Patented May. 11 1909.

FIE E--.

THF. NORRIS PETERS 00., WASHINGTON, 04 c,

TNTFETC,

HARRY EDWARD PERRA-ULT, OF DETROIT, MICHIGAN.

VALVE Mn orrAnIsM.

To all whom it may concern:

mom, a citizen. of the 1 United" States, and

residing at Detroit, in the countyoi vVayne.

and State of Michigan, have invented a new and useful Valve Mechanism,of which the following is a specification. v

This invention relates to valve mechanism for explosive engines,particularly to those of the four cycle type, and especially to thevalve mechanism for controlling the escape of the burned gases.

The obj ect of this invention is to provide an exhaust valve which willbefope'rated by the burned sage, and which will be under the control ofthe inlet valve as to the time of closing this exhaust passage.

A further object of, this invention is to provide a simple automaticeXha'ustvalve mechanism for explosive englnes which Is operable entirelyindependently of the crank shaft of the engine. My invention consists 1na valve to normally close the exhaust passage, which valve will beoperated to open the exhaust passage by the burned gases in the cylinderwhen the piston has reached the. end of its operative stroke, and whichvalve-will be held in such position'tha't the exhaustport remains openuntil the piston begins its charging stroke.

My invention is illustrated in the accompanying drawings, wherein Figure1 is a view of an engine cylinder with the exhaust valve easing shown insection. Ellis cylinder on a plane'at right angles to Similar referencecharacters refer to like parts throughout the several views.

The cylinder 1 is provided with theusual water passages 2 111 its wallsand-may beprovided witlrany desirable type of spark plug 3. The inletvalve casing 41: connects to the carburetor by means of a pipe 5.- This.

casing is provided with a valveseat 6 and ports 7, a valve 8 is movablehorizontally in this casing and has connected to it a stem 9, and isnormally held'in its seat by means of the spring 10.

The cylinder may be provided withian ex-- haust port llwhlch opens-intothe exhaust pipe 12. A second exhaust port 13 opens into the passage 14which leads into the lower end of the valve casing 15. A plug Fig. 2 isa central vertical section of 7 Specification of Letters Patent.

Patented May 11, 1909.

- Application-filed October as, 1907. Serial No. 398,885.

l of any desired type closes the lower end Be itknown thatfI, HARRYEDWARD PER- on the stein 23. The conical head 24 .at the upper end ofthe stem is adapted to engage the shoulder 25 on the leaf-spring 26 asshown in dotted lines in Fig. 2. The stem 9 .of the inlet valve 8 isreduced at 26 and fits into a slot at the upper'end of this leaf-Espring. gasesto open the exhaustpas- At the lower end of the. pipe 20,in a bore ,of the valve casing 15,'is an auxiliary valve v27 normallyheld upwardby the sprmg 28.

The strength of'this spring is such that the valve 27 will underordinary conditions be held over the passage or port 19 but with theleast pressure in the pipe 20, the valve 27 ;will descend, opening theport 19. The pisfton 30 is shown at the lower end of the stroke and thevalves are shown in their positions at the end of a charging stroke.

The operation of the valve mechanism is as follows: The parts being inpositions shown in the drawings, at the end of the s charging stroke,the piston 30 in rising will compress the charge and the usual explosionwill again drive it down to the position shown in the drawing. When thisoccurs, the cylinder will be full of burned gases under pressure, and assoon as the ports 11 and 18 are open, these gases will rush out throughthese ports, a portion escaping through the pipe 12, and a portionthrough the passage 14, raising the valve 21 until the port 17 of thecasing 15 is open, when they will escape through the pipe 18.

'VVhen this valve 21 is raised the conical head 24, at the upper end ofits stem, will Jengage-the shoulder 25 on the leaf-spring 26 and thevalve will be held above the port 17. The piston'30 in its upward stroketo clear the cylinder ofburned gases at once closes the ports lland 13.The valve 8 be ing seated, the gases are forced down through the pipe20. The slight pressure thus occasioned will depress the small valve 27to open the port 19 when the gas will rush down through the pipe 20,through the port 19 into the casing 15 and escape through the port 17 inpipe 18. This permits the burned gases in-the cylinder to escape to thesame'extent as is usual with four cycle engines. The piston indescending will at once relieve the pressure in the pipe and the valve27 will immediately close the port 19. Further movement of the pistonwill cause sufiicient vacuum in the cylinder to open the valve 8 andpermit the explosive charge to pass into the cylinder. At the end of thestroke of the piston the valve 8 will be seated through the action ofits spring 10. The cylinder being full of explosive mixture, no free airwill enter through the port 11. At the first opening of the valve 8 theshoulder on the leafspring 26 is pulled from under the head 2% on thestem of the valve 21, permitting the spring 22 to depress this valve 21and close the port 17. The parts are now in the same position that theywere at the beginning of the cycle just described.

The port 11 and pipe 12 are not necessary to the operation of thisengine but by the use of this port and pipe, the size of the port 13,the chamber 15, the port 17 and the valve 21 are decreased.

The relative positions and sizes of the different parts of thismechanism and their details may be varied according to the differenttypes of engines upon which such valve mechanism is adapted to be used.

aving 110W explained my improvements, what I claim as my invention anddesire to secure by Letters Patent is 1. A valve mechanism for explosionengines, comprising a cylinder, an exhaust valve casing connectedthereto, a valve in said casing adapted to close an exhaust port of thecylinder and adapted to be moved from said closing position by theburned gases of the engine, an inlet valve, and

means under the control of said inlet valve for holding the exhaustvalve in position open during the exhaust stroke and for releasing saidvalve so it may close said exhaust port.

2. A valve mechanism for tour-cycle explosive engines, comprising anexhaust valve, a chamber therefor having an inlet port from the enginecylinder which is uncovered by the piston of the engine at the end ofits stroke, an exhaust port, and a third port connecting to a passageleading to the explosion or upper end of the cylinder, said valveadapted to normally close the passage between the cylinder and theexhaust port and the passage to the upper end of the cylinder, butadapted to be moved from such position by the burned gases of the enginewhen the inlet port is uncovered by the piston of the engine to permitthe escape of said gases during the cleansing stroke of the piston.

3. A valve mechanism for explosion engines comprising a cylinderprovided with an inlet and an exhaust port, a. valve normallypositionedv to close the exhaust port and to be moved to open theexhaust port by the burned gases of the engine, an inlet valve, andmeans under control of the inlet valve to hold the exhaust valve at oneend of its movement;

In testimony whereof, I have signed this specification in the presenceof two suit scribing witnesses.

HARRY EDWARD lllliliAllh'l.

Witnesses AnoLrii RUHL, HARRY Srnnzenn.

